Fiat can't be oppressive, it's an inanimate object. Just like a gun doesn't draw people to violence, it's just a tool. Also, like others have mentioned, BTC wasn't made to eliminate fiat. It was made to give people a choice. To show them that the way of the government (go to school, get a job, take a loan, buy a house and a car, save for retirement, pay taxes, get social security) isn't the only way.
I think you haven't study where fiat comes from in your pocket and how it works. It is fundamentally a coercive form of currency. It is oppressive by design. And no, it is not an inanimate object, fiat is not only the paper bill, it is the whole system.
Governments across the world have very different views on how your life should be. Only in US (as far as I know) there is a second amendment designed to empower people with firearms so that they can protect themselves against tyrannical govs and choose a life they like. And only??? bitcoin/crypto empowers people to trade between themselves without the censorship from banks or other financial institutions and without the devaluating mechanics built in fiat.